Boxplots spaced by age on x axis

[eltef97]

Hi everyone, i could use some help. I'm trying to plot measurements from patients of various age in one boxplot, boxes by age. I don't have samples for every age, but i want x axis to just be ages 1-100 and boxes to apear wherever i have data.
I managed to put together regular boxplot graff, but i need help with the last part.
Here is my code.
data1 <- data.frame(measure=c(set1, set2 ,set3, set4))
ages <- rep(c(2,2, 18, 18, 24, 28, 37, 40, 41, 46, 55, 58, 61, 62, 77),each=4)
data2 <- cbind(data1,as.factor(ages))

ggplot(data = data2, aes(x=as.factor(ages), y=measure)) +
geom_boxplot() + geom_point() + geom_smooth(method = "lm", se=FALSE, color="black", aes(group=1))

(set1 contains one measurement for each patient, same for set2-3-4) They are ofcourse normalised.

[scottyd22]

One way would be to define ages as a factor in data2 and define the levels from 1 to 100. Then, in the plot, you no longer have to call as.factor(ages) (it was already done), and you can use scale_x_discrete(drop = F) to show all factor levels on the x-axis.

data2 <- cbind(data1, 
               ages = factor(ages, levels = 1:100)
               )

ggplot(data = data2, aes(x=ages, y=measure)) +
  geom_boxplot() + 
  geom_point() + 
  geom_smooth(method = "lm", se=FALSE, color="black", aes(group=1)) +
  scale_x_discrete(drop = F)

[eltef97]

Thank you, it worked perfectly. I'm kind of new to R, so sorry if the question was trivial.

[scottyd22]

Excellent! No need to apologize. There's a lot to learn, and this a place we all get to do it...together! Keep on exploring, and welcome to the community!